Department of Chemistry Graduate School of Engineering Science, Osaka University, Machikaneyama, Toyonaka, Osaka, 560-8531, Japan.
Present address: Chemistry Laboratory, The Jikei University School of Medicine, Kokuryo, Chofu, Tokyo, 182-8570, Japan.
Chemistry. 2018 Aug 27;24(48):12546-12554. doi: 10.1002/chem.201801992. Epub 2018 Aug 3.
The supramolecular chirality of aggregates consisting of achiral trans-bis(salicylaldiminato)Ni complex 1 bearing long alkyl chains can be generated and controlled precisely in a chiral nematic liquid-crystalline (LC) solvent, whereas the complex naturally forms achiral gel fibers in achiral nematic LC solvents and crystals in nonmesogenic solvents. The direction and intensity of the helicity of the gel fibers of 1 in the LC gel state can be adjusted by means of the nature of the helical twisting and the concentration of the chiral dopants. Helicity control was precisely detected in the circular dichroism (CD) spectra of LC gels and by direct SEM observation of the dried gel fibers. XRD analysis revealed that the flexibility of the herringbone-based lamellar alignment of this complex is the key to the LC-specific gelation and helicity control of the gel fibers.
由具有长烷基链的手性反式双（水杨醛亚胺）Ni 配合物 1 组成的聚集体的超分子手性可以在手性向列液晶（LC）溶剂中精确生成和控制，而该配合物在手性向列 LC 溶剂中自然形成非手性凝胶纤维，并在非介晶溶剂中形成晶体。LC 凝胶状态下 1 的凝胶纤维的螺旋方向和螺旋强度可以通过螺旋扭曲的性质和手性掺杂剂的浓度来调节。在手性 LC 凝胶的圆二色（CD）光谱和通过对干燥凝胶纤维的直接 SEM 观察中，精确地检测到了螺旋控制。XRD 分析表明，该配合物基于人字形的层状排列的柔韧性是 LC 特异性凝胶形成和凝胶纤维螺旋控制的关键。
